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2.配合力效应值的估算 由前面的数学模型(4-2)、(4-3)和附加条件(4-4)、(4-5)可知,组合平均数x_ij的数学结构为 x_ij=u+g_i+g_j+s_ij+e_ij (5-1)这里用e_ij表示e_ijkl关于k、l的平均值,显然它也是一个独立正态随机变量,期望值为零,方差为。 在这个数学结构中,x_ij是从观察值中计算出来的若干个平均数,它是已知的,而等式右端的效应值u、g_i、s_ij并不知道,需要设法利用已知的x_ij估计出这些
(2) Estimation of Combining Ability Effect From the mathematical models (4-2), (4-3) and the additional conditions (4-4) and (4-5), we can see that the mathematical structure of the combined average x_ij is x_ij = u + g_i + g_j + s_ij + e_ij (5-1) Here we use e_ij to denote the average value of e_ijkl about k, l. Obviously it is also an independent normal random variable with expectation of zero and variance of. In this mathematical structure, x_ij is a number of averages calculated from observations that are known and the effect values u, g_i, s_ij at the right end of the equation are unknown and need to be managed using known x_ij estimates Out of these